A simple theoretical model for the onset of flame front inversion for flames propagating in closed or half-open ducts

IF 6.7 1区 工程技术 Q2 ENERGY & FUELS
Fuel Pub Date : 2024-06-29 DOI:10.1016/j.fuel.2024.132304
Andrés Z. Mendiburu
{"title":"A simple theoretical model for the onset of flame front inversion for flames propagating in closed or half-open ducts","authors":"Andrés Z. Mendiburu","doi":"10.1016/j.fuel.2024.132304","DOIUrl":null,"url":null,"abstract":"<div><p>The present work aims to develop a simple theoretical model to study the propagation of flames in closed or half-open ducts in the early stages of the process including the onset of flame front inversion. It is known from previous studies that flame propagation in these configurations is characterized by four stages, namely the spherical flame stage, the finger flame stage, the flat flame stage, and the flame front inversion stage. The fourth stage is also called the tulip flame stage. The instant at which the flame skirt region touches the side walls of the duct (or tube) is here considered the onset of the flame front inversion phenomenon. In order to accurately represent the early stages of flame propagation and the onset of flame front inversion, a theoretical model was developed that takes into account the effects of compressibility. It was also possible to obtain an analytical solution for this model. The effect of compressibility was incorporated into the model through a parameter that depends on the initial Mach number of the mixture and on the expansion ratio of the flame. The results obtained with the model were compared with experimental results from the literature concerning mixtures of hydrogen, carbon monoxide and air in different compositions and equivalence ratios, in closed and half-open ducts. The model was shown to be adequate to represent the early staged for flames propagating in closed or half-open ducts. The model for determination of the time at which the flame skirt touches the side walls of the duct showed an average value of the relative errors of 1.84% when compared to available experimental data for H<sub>2</sub>/CO/air.</p></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":null,"pages":null},"PeriodicalIF":6.7000,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fuel","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0016236124014522","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0

Abstract

The present work aims to develop a simple theoretical model to study the propagation of flames in closed or half-open ducts in the early stages of the process including the onset of flame front inversion. It is known from previous studies that flame propagation in these configurations is characterized by four stages, namely the spherical flame stage, the finger flame stage, the flat flame stage, and the flame front inversion stage. The fourth stage is also called the tulip flame stage. The instant at which the flame skirt region touches the side walls of the duct (or tube) is here considered the onset of the flame front inversion phenomenon. In order to accurately represent the early stages of flame propagation and the onset of flame front inversion, a theoretical model was developed that takes into account the effects of compressibility. It was also possible to obtain an analytical solution for this model. The effect of compressibility was incorporated into the model through a parameter that depends on the initial Mach number of the mixture and on the expansion ratio of the flame. The results obtained with the model were compared with experimental results from the literature concerning mixtures of hydrogen, carbon monoxide and air in different compositions and equivalence ratios, in closed and half-open ducts. The model was shown to be adequate to represent the early staged for flames propagating in closed or half-open ducts. The model for determination of the time at which the flame skirt touches the side walls of the duct showed an average value of the relative errors of 1.84% when compared to available experimental data for H2/CO/air.

在封闭或半开放管道中传播的火焰开始出现火焰前反转的简单理论模型
本研究旨在建立一个简单的理论模型,以研究火焰在封闭或半开放管道中传播的早期阶段,包括火焰前沿反转的开始阶段。根据以往的研究可知,火焰在这些结构中的传播有四个阶段,即球形火焰阶段、指状火焰阶段、扁平火焰阶段和火焰前沿反转阶段。第四阶段也称为郁金香火焰阶段。在这里,火焰裙边区域接触风道(或管道)侧壁的瞬间被认为是火焰前沿反转现象的开始。为了准确表示火焰传播的早期阶段和火焰前沿反转的开始,我们开发了一个考虑到可压缩性影响的理论模型。该模型也可以获得分析解。模型中的可压缩性参数取决于混合物的初始马赫数和火焰的膨胀率。模型得出的结果与文献中关于氢气、一氧化碳和空气在封闭和半开放管道中的不同成分和当量比混合物的实验结果进行了比较。结果表明,该模型足以表示火焰在封闭或半开放管道中传播的早期阶段。该模型用于确定火焰裙部接触管道侧壁的时间,与 H2/CO/air 的现有实验数据相比,平均相对误差为 1.84%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Fuel
Fuel 工程技术-工程:化工
CiteScore
12.80
自引率
20.30%
发文量
3506
审稿时长
64 days
期刊介绍: The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.
文献相关原料
公司名称 产品信息 采购帮参考价格
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信